I have added a 1 pt rule to an InDesign book that is being exported to an ePub but when I export the file I get a warning stating: "Non rectangular objects will not appear correctly when exported using CSS". Once I take the rule out, the warning goes away. However, the rule appears in both the iBook and Kindle Preview with no problems. I have also tried adding the rule in the Paragraph Styles but nothing shows up. How do I correctly add a rule?
Moving to InDesign EPUB forum.